package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    //微信服务接口地址
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;


    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        String openId = getOpenId(userLoginDTO.getCode());

        //判断openId是否为空,如果不为空就证明成功，抛出异常就会失败
        if (openId==null)
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);

        //判断是不是为新用户
        User user = userMapper.getUserByOpenId(openId);

        if(user==null){
            user=User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回对象
        return user;
    }

    /**
     * 调用微信你接口服务，获得微信用户的openId
     * @param code
     * @return
     */
    private String getOpenId(String code){
        //调用微信接口服务,获得当前微信用户的openid
        Map<String,String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN,map);

        //转化为json字符串
        JSONObject jsonObject = JSON.parseObject(json);

        //获得openId
        String openId =jsonObject.getString("openid");
        return openId;


    }

}
